• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 16
  • 1
  • 1
  • 1
  • Tagged with
  • 18
  • 18
  • 8
  • 6
  • 5
  • 3
  • 3
  • 3
  • 3
  • 3
  • 3
  • 2
  • 2
  • 2
  • 2
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

The normal function of the androgen receptor plays a role in the pathology of SBMA /

Thomas, Patrick Shane, January 2007 (has links)
Thesis (Ph. D.)--University of Washington, 2007. / Vita. Includes bibliographical references (leaves 112-138).
12

Genetic variation and prostate cancer : population-based association studies in Sweden /

Lindström, Sara, January 2007 (has links)
Diss. (sammanfattning) Umeå : Univ., 2007. / Härtill 5 uppsatser.
13

The effect of the polyglutamine expansion of the Androgen Receptor on the ubiquitin proteasome system for protein degradation

Scanlon, Thomas Carr. January 1900 (has links)
Thesis (Ph.D.). / Written for the Dept. of Human Genetics. Title from title page of PDF (viewed 2008/02/12). Includes bibliographical references.
14

Steroid regulation of seasonal territorial aggression in the male song sparrow, Melospiza melodia morphna /

Wacker, Douglas W. January 2007 (has links)
Thesis (Ph. D.)--University of Washington, 2007. / Vita. Includes bibliographical references (leaves 91-106).
15

Medroxyprogesterone acetate : a dual function hormone that is both a progestin and an androgen in human breast cancer cells /

Ghatge, Radhika P. January 2005 (has links)
Thesis (Ph.D. in Molecular Biology) -- University of Colorado at Denver and Health Sciences Center, 2005. / Typescript. Includes bibliographical references (leaves 89-109 and 224-228).
16

Effect of novel mutations in androgen receptor upon molecular mechanisms = Efeitos de novas mutações no receptor de andrógenos sobre os mecanismos moleculares / Efeitos de novas mutações no receptor de andrógenos sobre os mecanismos moleculares

Petroli, Reginaldo José, 1980- 25 August 2018 (has links)
Orientadores: Maricilda Palandi de Mello, Fernanda Caroline Soardi / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Biologia / Made available in DSpace on 2018-08-25T03:55:23Z (GMT). No. of bitstreams: 1 Petroli_ReginaldoJose_D.pdf: 6228632 bytes, checksum: e6e99d402e3d99ccab57c84290065e84 (MD5) Previous issue date: 2014 / Resumo: O receptor de andrógenos (AR) é um fator de transcrição pertencente à superfamília de receptores nucleares e é ativado por fosforilação e dimerização sob a ligação ao hormônio. Várias funções são atribuídas a este receptor, sendo a principal delas o desenvolvimento e manutenção das características sexuais masculinas, atua na regulação da expressão gênica e diferenciação celular em tecidos alvos. O presente trabalho teve por objetivo principal a análise do efeito das mutações p.Pro695Ser, p.Ser759Tre, p.Leu768Val., p.Cis806Fen+p.Gln798Glu, p.Leu830Fen, p.Ile898Fen e p.Pro904Arg sobre a função do AR. As mutações acima citadas, localizadas no domínio de ligação ao hormônio, foram identificadas por sequenciamento direto do gene do AR de pacientes 46,XY com diferentes graus da Síndrome da Insensibilidade Androgênica (AIS). Mutações nesse domínio geralmente rompem a ligação aos andrógenos naturais, porém há algumas que não afetam essa ligação, mas interferem na interação entre os domínios amino e carboxi-terminal (N/C terminal), importante para a estabilização receptor-ligante. Assim, ambas funções foram investigadas. Para se avaliar a capacidade de transativação das proteínas AR mutantes, foi realizada a técnica de mutagênese sítio dirigida no cDNA completo, seguida de transfecção e expressão em células e mamíferos e, análise de transativação induzida por concentrações crescentes de 5?-diidrotestosterona (DHT) utilizando-se um gene repórter. A análise das interações N/C-terminal para cada AR mutante foi realizada pela técnica de duplo-híbrido em células de mamíferos. A mutação p.Pro695Ser apresentou atividades de transativação de 85% e 82% nos ensaios transativação com o cDNA completo e no duplo-híbrido, respectivamente, em valores de DHT fisiológicos (cerca de 1 nM). As atividades atingiram valores normais em concentrações elevadas de DHT indicando um baixo efeito sobre a atividade gonadal. No entanto, em concentrações de DHT inferiores a atividade de transativação decai para menos de 50% nos dois experimentos, podendo afetar as funções do AR em tecidos não gonadais. Esta mutação foi considerada "branda" e corresponde perfeitamente ao fenótipo masculino do paciente que se apresentava com ginecomastia, mas com fertilidade preservada. Com 1 nM de hormônio, as mutações p.Ser759Tre, p.Leu830Fen, p.Ile898Fen apresentaram atividade de transativação superior a 20%, havendo um aumento de resposta com concentrações crescentes. No entanto, o comportamento de cada uma no experimento de interação N/C diferiu sendo que a p.Ile898Fen não apresentou atividade em nenhuma concentração de ligante; as p.Ser759Tre e p.Leu830Fen responderam positivamente ao aumento da concentração de DHT atingindo 50% e 250% da atividade trancricional do receptor selvagem, respectivamente. Esses resultados indicam um fenótipo parcial de AIS (PAIS) para os portadores das mutações p.Ser759Tre e p.Leu830Fen. Nesses casos verificou-se uma boa correlação dos achados funcionais com os fenótipos dos pacientes que apresentavam graus variados de PAIS. Já para a mutação p.Ile898Fen o fenótipo esperado baseando-se nos resultados funcionais seria o de AIS na forma completa (CAIS), porém os pacientes portadores desta mutação apresentavam graus variados de ambiguidade genital compatíveis com o fenótipo PAIS. Isto indica que outros fatores devem estar influenciando a manifestação fenotípica nesse caso. A mutação p.Leu768Val apresentou atividade transcricional nula em 1 nM de DHT nos dois experimentos, um perfil típico do fenótipo CAIS apresentado pelo portador desta mutação. As mutações p.Gln798Glu e p.Cis806Fen estudadas separadamente apresentaram respostas à indução de DHT semelhantes às de mutações "brandas" e PAIS, respectivamente. No entanto, quando estudadas em conjunto, a atividade de transativação com 1 nM foi inferior a 10%, aumentando com o aumento da concentração de ligante, comportamento compatível com mutações mais graves resultando no fenótipo CAIS observado nesse caso. Por último, a mutação p.Pro904Arg, embora tenha reduzido a atividade trancricional para cerca de 20% da selvagem no experimento com o cDNA completo, no experimento com duplo híbrido a atividade foi nula indicando uma ação mais grave compatível com a forma CAIS observada. A análise funcional do AR aqui realizada pode elucidar alguns mecanismos moleculares associados a cada mutação, bem como pode fornecer subsídios para a resposta ao tratamento com DHT em cada caso em particular / Abstract: The androgen receptor (AR) is a transcription factor that belongs to the superfamily of nuclear receptors activated by phosphorylation and dimerization by hormone binding. Several functions are attributed for AR, like male sex development, regulation of gene expression and cell differentiation in target tissues. The aim of this study was to analyze the effect of mutations p.Pro695Ser, p.Ser759Tre, p.Leu768Val, p.Cys806Phe+ p.Gln798Glu, p.Leu830Phe, p.Ile898Phe and p.Pro904Arg upon AR transactivation activity. All mutations studied here are located in the hormone-binding domain and were identified in patients with different degrees of androgen insensitivity syndrome (AIS) by AR gene sequencing. Mutations in this domain can result in the impairment of androgen ligation, but there are cases that it does not affect the binding but interfere with the interaction between the amino and carboxi-terminal domains (N/C terminal), important step for receptor-binding stabilization. Thus, both functions have been studied in this work. To evaluate the ability of AR transactivation of mutant proteins, the site-directed mutagenesis assay was performed on full-length cDNA, followed by transfection and expression in mammalian cells. The analysis of transactivation of a reporter gene with different dihydrotestosterone (DHT) concentrations was performed. The analysis of N/C-terminal interactions for each mutant AR was performed by two- hybrid mammalian assay. The mutation p.Pro695Ser reveled transactivation activities of 85% and 82% in transactivation assays with the full-length cDNA and two hybrid assay, respectively, at DHT physiological values (approximately 1 nM). The activities reached normal values at high DHT concentrations, indicating a low effect on gonadal activity. However, in low DHT concentrations, the transactivation activity decays to less than 50% in both experiments, which may affect AR functions in non-gonadal tissues. This mutation was considered "mild" and corresponds perfectly to the male phenotype of the patient who presented with gynecomastia, but with preserved fertility. With 1 nM hormone, the p.Ser759Tre, p.Leu830Phe, p.Ile898Phe mutations showed transactivation activity higher than 20%, the response increased with higher DHT concentrations. However, in N/C interaction assays, those mutations showed different results. The p.Ile898Phe revealed a complete disruption in N/C interaction at all hormone concentrations; the p.Ser759Tre and p.Leu830Phe showed positive response with the increasing in DHT concentrations and reached 50% and 250% of the transcriptional activity of wild type, respectively. Such results indicate a partial AIS phenotype (PAIS) as functional effect for p.Ser759Tre and p.Leu830Phe. In these cases there was a positive correlation with the phenotypes of patients that presented different degrees of PAIS. For the p.Ile898Phe, the expected phenotype based on functional analysis would be the complete form of AIS (CAIS), but the patients with this mutation had variable degrees of genital ambiguity consistent to PAIS. This indicates that other factors must influence the phenotypic manifestation. The p.Leu768Val revealed a complete disruption at 1 nM DHT in both experiments, typical of CAIS. The p.Gln798Glu and p.Cys806Phe mutations studied separately revealed responses to the induction of DHT similar to Mild and Partial phenotypes, respectively. However, when analyzed together, the transactivation activity of 1 nM was lower than 10%, increasing in high ligand concentration, which is consistent to CAIS phenotype. Finally, p.Pro904Arg, although showed residual transcriptional activity around 20% of the wild type in the experiment with the full-length cDNA, it abolished the transcriptional activity when N/C terminal interaction was tested indicating a CAIS phenotype, as observed in the patient. Functional analysis of the AR performed here could elucidate some molecular mechanisms associated with each mutation, and may provide a basis for response to treatment with DHT in each particular case / Doutorado / Genetica Animal e Evolução / Doutor em Genetica e Biologia Molecular
17

Role of FoxO factors as the nuclear mediator for PTEN-AR antagonism in prostate cancer cells /

Ma, Qiuping. January 2008 (has links)
Dissertation (Ph.D.)--University of South Florida, 2008. / Includes vita. Includes bibliographical references. Also available online.
18

Značaj određivanja androgenih receptora u odgovoru na hormonsku terapiju kod estrogen receptor pozitivnih pacijenata sa karcinomom dojke / The significance of determining the androgen receptors in response to hormonal therapy in estrogen receptor-positive breast cancer patients

Vidović Vladimir 04 August 2020 (has links)
<p>Glavni problem u lečenju karcinoma dojke je kako na osnovu kliničke klasifikacije i morfolo&scaron;kih osobina tumora predvideti njegovo dalje pona&scaron;anje. Vrlo često ni kombinacija standardnih prognostičkih faktora ne daje odgovor o potrebi davanja adjuvantne hemioterapije. U cilju sprovođenja adekvatne dalje terapije karcinoma dojke i otkrivanja agresivnih tipova tumora, a nakon hirur&scaron;kog lečenja, postoji stalna potreba za pronalaženjem novih pokazatelja pomoću kojih bi se identifikovale bolesnice koje imaju povećan rizik od razvoja relapsa bolesti. Ciljevi ove studije su bili da se odredi učestalost ekspresije androgenih receptora (AR) u infiltrativnom duktalnom karcinomu dojke. Da se utvrdi povezanost ekspresije AR i kliničko-patolo&scaron;kih prognostičkih faktora u infiltrativnom duktalnom karcinomu dojke. Odnos ekspresije AR i ekspresije estrogen receptora (ER), progesteron receptora (PR) i humanog epidermalnog faktora rasta (HER-2). Da se proceni povezanosti pozitivne ekspresije AR, kao i odnosa AR/ER, sa odgovorom na primenjenu hormonsku terapiju kod ER pozitivnih bolesnica. Da se proceni povezanost ekspresije AR, kao i odnosa AR/ER, sa kliničkim tokom bolesti: pojavom recidiva, metastaza, kao i smrtnim ishodom u toku petogodi&scaron;njeg perioda praćenja pacijentkinja. Istraživanjem je obuhvaćeno oko 200 pacijentkinja obolelih od infiltrativnog duktalnog karcinoma dojke, koje su operisane na Institutu za onkologiju Vojvodine u periodu 2010-2012. godine. Pacijentkinje su odabrane metodom slučajnog izbora. Ne postoji statistički značajna razlika između kliničko patololo&scaron;kih faktora i ekspresije androgenih receptora. Kod pacijentkinja sa infiltrativnim duktalnih karcinomom dojke koje su ER-/AR+ nije pokazana statistički značajna razlika u HER2 proteinskoj ekspresiji. Učestalost receptora za progesteron, estrogen, HER2, Ki-67, tripl negativne ćelija ne karakteri&scaron;u prisustvo androgenskih receptora Nije dokazana statistička značajnost za prvi i drugi stadijum bolesti duktalnog invazivnog karcinoma dojke kada se uzme u obzir kraće vreme preživljavanja kod pacijentkinja koje su primale hormonoterapiju. Statistički značajno kraće vreme preživljavanja pokazano je za treći stadijum bolesti kod pacijentkinja koje su AR i ER (&ge; 2) u odnosu na pacijentkinje kod kojih je odnos AR/ER &lt; 2, čime je za treći stadijum bolesti dokazana inicijalna hipoteza . Analize u prikazanom istraživanju nisu pokazale statističku značajnost kada se porede učestalost relapsa i smrtnog ishoda kada se posmatraju pacijentkinje sa AR pozitivnim i AR negativnim infiltrativnim duktalnim karcinomom dojke. Pokazana je statistički značajna razlika u učestalosti smrtnog ishoda između pacijenatkinja koje su lečene i inhibitorima aromataze i tamoksifenom. Zaključci ove studije bi mogli biti osnova za preporuku da se utvrđivanje ekspresije AR kod karcinoma dojke uvrsti u rutinsku praksu i sadržaj patohistolo&scaron;kog nalaza. Određivanje odnosa ekspresije AR i ER u grupi ER pozitivnih bolesnica moglo bi poslužiti kao vodič za primenu konvencionalne hormonske terapije ili, s druge strane, preporuka za terapiju antiandrogenima, sa ciljem da se izborom novih terapijskih modaliteta pobolj&scaron;a efikasnost lečenja bolesnica sa karcinomom dojke.</p> / <p>The main problem in the treatment of breast cancer is how to predict its future behavior based on the clinical classification and morphological characteristics of the tumor. Very often even a combination of standard prognostic factors does not answer the need for adjuvant chemotherapy. In order to conduct adequate further breast cancer therapy and to detect aggressive tumor types, and following surgical treatment, there is a continuing need to find new indicators to identify patients at increased risk of relapse. The objectives of this study were to determine the frequency of androgen receptor (AR) expression in infiltrative ductal breast cancer. To determine the association between AR expression and clinical-pathological prognostic factors in infiltrative ductal breast cancer. Relationship between AR expression and expression of estrogen receptor (ER), progesterone receptor (PR), and human epidermal growth factor (HER-2). To evaluate the association of positive AR expression, as well as the AR / ER ratio, with response to hormone therapy in ER positive patients. To evaluate the association of AR expression, as well as the relationship of AR / ER, with the clinical course of the disease: onset of relapse, metastasis, as well as fatal outcome during the 5-year follow-up period. The study included about 200 patients suffering from infiltrative ductal breast cancer, operated on at the Institute of Oncology of Vojvodina in the period 2010-2012. years. Patients were selected by random selection. The results there is no statistically significant difference between clinically pathologic factors and androgen receptor expression. No statistically significant difference in HER2 protein expression was shown in patients with infiltrative ductal breast cancer who are ER- / AR +. The frequency of progesterone receptors, estrogen, HER2, Ki-67, tripl negative cells do not characterize the presence of androgen receptors. No statistical significance was demonstrated for the first and second stages of ductal invasive breast cancer when considering shorter survival times in patients receiving hormone therapy. A statistically significant shorter survival time was shown for the third stage of disease in patients with AR and ER (&ge; 2) compared to patients with an AR / ER ratio of &lt;2, thus proving an initial hypothesis for the third stage of disease. The analyzes in the study presented showed no statistical significance when comparing the incidence of relapse and death when looking at patients with AR positive and AR negative infiltrative ductal breast cancer. There was a statistically significant difference in the incidence of death between patients treated with both aromatase inhibitors and tamoxifen. Conclusions of this study could be the basis for recommending that the determination of AR expression in breast cancer be incorporated into the routine practice and content of pathohistological findings. Determining the ratio of AR and ER expression in a group of ER-positive patients could serve as a guide for the administration of conventional hormone therapy or, on the other hand, a recommendation for anti-androgen therapy, with the aim of improving the effectiveness of breast cancer treatment in the choice of new therapeutic modalities.</p>

Page generated in 0.049 seconds